Neptune

<p style="color:#dbdbdb ;padding:20px; border-left:5px solid #7f7f7f;">It is well known that most of the important planets revolve around the Sun. They existed hundreds of years ago but were discovered later through telescopes or spacecrafts. Most of the planets were discovered accidentally. However, there is a vivid blue-coloured planet that remained undiscovered for many years and was the first planet to be found mathematically by the scientists. The eighth planet from the Sun, Neptune is about 17 times the mass of the Earth and is slightly more massive than its neighbour planet Uranus. After the discovery of Pluto, Neptune is the second-most distant planet in the solar system and is hence not visible from the naked eye. Named after the famed Roman God of the Sea, it was interestingly the first planet whose existence was predicted by mathematical calculations, even before it was discovered by a telescope.</p>
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Mercury

<p style="color:#dbdbdb ;padding:20px; border-left:5px solid #7f7f7f;">In our solar system, Mercury is the second smallest planet. In size, it is slightly larger than the Earth’s moon. Being at a distance of around 58 million kilometers (36 million miles), Mercury is the closest planet to the Sun. The complete orbit around the Sun by the planet is in just 88 Earth days. Mercury comprises a solid, cratered surface; which is similar to the Earth’s Moon. The planet neither comprises rings around it nor does it have any natural satellites. Mercury’s exosphere or thin atmosphere is mainly composed of oxygen, sodium, hydrogen, helium and potassium. Mariner 10 in the year 1974–1975 and Messenger are the only two space aircrafts to have visited this rocky planet. Until today, no evidence for life has been found on this planet. The Sun would appear more than three times larger than it does on Earth, if standing on the surface of the planet, at its most distant point to the Sun. Being a rocky planet, Mercury is also sometimes referred as a terrestrial planet.</p>
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Mars

<p style="color:#dbdbdb ;padding:20px; border-left:5px solid #7f7f7f;">Planets other than Earth have an atmosphere under such extreme conditions, or their surface so unfavourable, that it becomes difficult for life to sustain on them. However, with the exception of Earth, there is one planet in the solar system which is hospitable to life. And that planet is none other than Mars. Mars is similar to Earth in many ways. It has clouds, winds, a roughly 24-hour day, seasonal weather patterns, tolerable temperatures, polar ice caps, volcanoes, canyons, and many other familiar features. It is a scientific stimulating belief that centuries ago, Mars was even more Earth-like than today, with denser air and more water. However, it is a frozen sterile desert today, but there is a reason to believe that water is hidden safely below its surface. It has a very weak gravity and cannot hold on to the atmosphere. The fourth planet from the Sun, Mars is named after the Roman god of War. This could probably be because of its blood-red colour. The tallest mountain on Mars, Olympus Mons (21 km high and 600 km diameter), is also the tallest mountain in the solar system. Let us explore the planet further.</p>
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